public class Circle {
    
    private double radius;

   
    public Circle() {}

    public Circle(double radius) {
        this.radius = radius;
    }


    public void setRadius(double radius) {
        this.radius = radius;
    }


    public double getRadius() {
        return radius;
    }


    public String getPerimeter() {
        double perimeter = 2 * Math.PI * radius;
        return String.format("%.2f", perimeter);
    }

  
    public String getArea() {
        double area = Math.PI * radius * radius;
        return String.format("%.2f", area);
    }

  
    public String display() {
        return getPerimeter() + "," + getArea();
    }
}

